CN112509739A - Explosion-proof cable, explosion-proof cable leakage detection device and method and power supply circuit - Google Patents
Explosion-proof cable, explosion-proof cable leakage detection device and method and power supply circuit Download PDFInfo
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- CN112509739A CN112509739A CN202011392274.1A CN202011392274A CN112509739A CN 112509739 A CN112509739 A CN 112509739A CN 202011392274 A CN202011392274 A CN 202011392274A CN 112509739 A CN112509739 A CN 112509739A
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- proof cable
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by unbalance of two or more currents or voltages, e.g. for differential protection
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The embodiment of the invention discloses an explosion-proof cable. The explosion-proof cable is characterized by comprising: the conductive shielding layer is wrapped outside each phase line; a zero line; and the insulating layer is wrapped outside the at least one phase line and the zero line. The leakage protection switch provided by the embodiment of the invention can be used in an IT system.
Description
Technical Field
The invention relates to the technical field of safety electricity utilization, in particular to an explosion-proof cable, an explosion-proof cable electric leakage detection device, an explosion-proof cable electric leakage detection method and a power supply circuit.
Background
At present, in mines, particularly coal mines, the requirements on cables for transmitting electric power are very high, and in order to prevent a phase line in the cable from puncturing an insulating layer to cause cable explosion due to the fact that the insulating layer outside the cable is damaged; of course, the internal short circuit and the electric leakage of the cable can also cause the explosion of the cable; the aging of the cable, the abrasion of the cable and the reduction of the insulation performance of the insulating layer caused by the temperature rise of the cable in the using process can cause electric accidents, and the explosion of the cable is caused.
Thus, an explosion-proof cable capable of preventing explosion is produced, and the existing explosion-proof cable is only used for enhancing the wear resistance of an external insulating layer thereof, so that the excessive abrasion of the insulating layer is avoided, and in this case, if electric leakage or short circuit accidents occur inside the explosion-proof cable, the explosion of the explosion-proof cable can also be caused.
The structure of the existing explosion-proof cable can not detect the capacitance leakage caused by the length of the electric wire and the leakage caused by the temperature rise or aging of the cable.
In summary, the conventional explosion-proof cable cannot detect the internal leakage and short circuit, and thus cannot fundamentally solve the problem of cable explosion.
Disclosure of Invention
Therefore, the embodiment of the invention provides an explosion-proof cable, an explosion-proof cable leakage detection device, an explosion-proof cable leakage detection method and a power supply circuit; the explosion-proof cable can detect phase line electric leakage through the conductive shielding layer.
In one aspect, an explosion-proof cable provided in an embodiment of the present invention includes: the conductive shielding layer is wrapped outside each phase line; a zero line; and the insulating layer is wrapped outside the at least one phase line and the zero line.
The explosion-proof cable is introduced with the independent conductive shielding layer, so that the reduction of the insulation performance of the explosion-proof cable caused by aging, abrasion, temperature and other reasons can be monitored, and the electric power accident possibly caused can be avoided.
In one embodiment of the invention, the phase lines are three; the zero line clamp is arranged among the three phase lines.
In one embodiment of the invention, said conductive shielding layers of each of said phase lines are electrically connected to each other, respectively.
In another aspect, according to an embodiment of the present invention, there is provided an explosion-proof cable leakage detecting device, where the first explosion-proof cable is the explosion-proof cable according to any one of the above embodiments, and has a first end and a second end opposite to each other along a power transmission direction; the leakage protection switch is provided with an input end and an output end, the output end is electrically connected with the first end of the explosion-proof cable, the input end comprises a phase line input end, and the output end comprises a zero line output end; the trigger circuit is electrically connected between the phase line access end and the zero line access end and is provided with a trigger switch; a leakage detector electrically connected between the output terminal of the leakage protection switch and the first end of the explosion-proof cable; the method comprises the following steps: the optical coupling circuits are respectively and electrically connected between each phase line and the zero line and the conductive shielding layer of the first explosion-proof cable; and the controller is electrically connected with the optical coupling circuits and is also in control connection with the trigger switch.
In one embodiment of the present invention, the explosion-proof cable leakage detecting device further includes: a second explosion-proof cable, which is the explosion-proof cable according to any one of the above embodiments and has a third end and a fourth end opposite to each other along the power transmission direction; wherein the fourth terminal is electrically connected to the input terminal.
In one embodiment of the present invention, the explosion-proof cable leakage detecting device further includes: the conducting circuit is electrically connected between the conductive shielding layer of the first explosion-proof cable and the conductive shielding layer of the second explosion-proof cable and is provided with a conducting switch; wherein, the leakage detector is also connected with the conducting switch.
In another aspect, an embodiment of the present invention provides an explosion-proof cable leakage detection method, including: the leakage detector in the leakage detection device for the explosion-proof cable according to any one of the above embodiments performs leakage detection on the first explosion-proof cable; wherein a controller in the leakage detector performs the steps of: acquiring a plurality of first current data values respectively detected by the plurality of optical coupling circuits; judging the magnitude relation between each first current data value and a preset current threshold value; and when any one of the first current data values is judged to be not smaller than the current threshold value, determining the leakage of the first explosion-proof cable.
On the other hand, in the explosion-proof power transmission line of the IT system provided in the embodiment of the present invention, at least one explosion-proof cable is the explosion-proof cable described in any one of the above embodiments, and is electrically connected in sequence; and the at least one electric leakage detection device is electrically connected to the explosion-proof cable respectively.
In another aspect, according to the method for detecting and identifying an electric leakage position of an explosion-proof power transmission line provided in an embodiment of the present invention, in the explosion-proof power transmission line based on an IT system as described in the above embodiment, the controller of each electric leakage detection device respectively executes the following steps: acquiring a plurality of first current data values respectively detected by a plurality of corresponding optical coupling circuits; judging the magnitude relation between each first current data value and a preset current threshold value; when any one of the first current data values is judged to be not smaller than the current threshold value, controlling the corresponding conducting switch to be switched off; acquiring a plurality of second current data values respectively detected by the plurality of optical coupling circuits again; judging the magnitude relation between each second current data value and the current threshold value; and when any one of the second current data values is judged to be not smaller than the current threshold value, determining the electric leakage of the explosion-proof cable detected by the corresponding electric leakage detection device.
In summary, the above embodiments of the present application may have at least the following advantages or benefits: i) the explosion-proof cable can perform electric leakage detection on the corresponding phase line through the conductive shielding layer, and can detect electric leakage and short circuit conditions inside the explosion-proof cable; ii) the explosion-proof cable can be a three-phase cable or a single-phase cable to meet the existing power demand; iii) the anti-explosion cable leakage detection device can detect whether the first anti-explosion cable leaks electricity or not by arranging the leakage detector, and when the leakage of the first anti-explosion cable is detected, the electric connection of the first anti-explosion cable is disconnected by the leakage protection switch, so that the explosion problem of the first anti-explosion cable caused by continuous power supply under the condition of leakage of electricity is prevented; iv) a power supply circuit consisting of a plurality of said explosion-proof cables, which can be used in mines, in particular coal mines.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an explosion-proof cable 100 according to a first embodiment of the present invention.
Fig. 2 is a sectional view of an explosion-proof cable 100 according to a first embodiment of the present invention.
Fig. 3 is a cross-sectional view of another explosion-proof cable 100 according to the first embodiment of the present invention.
Fig. 4 is a schematic view of a connection structure between an explosion-proof cable leakage detecting device 200 according to a second embodiment of the invention and the explosion-proof cable 100 shown in fig. 2.
Fig. 5 is a schematic view of another connection structure of the explosion-proof cable leakage detecting device 200 according to the second embodiment of the invention and the explosion-proof cable shown in fig. 2.
Fig. 6 is a schematic view of a connection structure between an explosion-proof cable leakage detecting device 200 according to a second embodiment of the invention and the explosion-proof cable 100 shown in fig. 3.
Fig. 7 is a schematic view of another connection structure of the explosion-proof cable leakage detecting device 200 according to the second embodiment of the invention and the explosion-proof cable 100 shown in fig. 3.
Fig. 8 is a flowchart of an explosion-proof cable leakage detection method according to a third embodiment of the present invention.
Fig. 9 is an explosion-proof power transmission line based on an IT system according to a fourth embodiment of the present invention.
Fig. 10 is a flowchart of an anti-explosion power transmission line leakage position detection and identification method according to a fifth embodiment of the present invention.
Description of the main element symbols:
100 is an explosion-proof cable; 10 is a phase line; 11 is a phase line insulating layer; 13 is a conductive shielding layer; 14 is a connecting line; 30 is a zero line; 31 is a zero line insulating layer; 40 is an insulating layer;
200 is an explosion-proof cable leakage detection device; 110 is a leakage protection switch; 111 is a first output terminal; 112 is a first input terminal; 120 is an alarm circuit; 121 is an alarm; 122 is an alarm switch; 130 is a trigger circuit; 131 is a discharge resistor; 132 is a trigger switch; 140 is an optical coupling circuit; 150 is an amplifying circuit; 160 is a controller; 170 is a signal lamp; 180 is a control switch; 190 is a conducting circuit; and 191 is a conducting switch.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
[ first embodiment ] A method for manufacturing a semiconductor device
Referring to fig. 1, which is a schematic structural diagram of an explosion-proof cable according to a first embodiment of the present invention, the explosion-proof cable 100 includes, for example: at least one phase wire 10, a neutral wire 30, and an outer insulation 40 surrounding the phase wire 10 and the neutral wire 30. The phase line insulating layer 11 wraps the outside of each phase line 10, the conductive shielding layer 13 wraps the outside of the phase line insulating layer 11, when the phase line insulating layer 11 is damaged, the phase lines 10 can be in contact with the conductive shielding layer 13, human body injury caused by the fact that a human body directly contacts a leakage position is avoided, and meanwhile, the leakage situation can be detected through the conductive shielding layer 13; the zero line 30 is wrapped with a zero line insulating layer 31 to prevent the zero line 30 from directly contacting the phase line 10 and the conductive shielding layer 13 to cause short circuit.
Preferably, with reference to fig. 2, the flameproof cable 100 may be a three-phase cable, for example consisting of three phase lines 10 and a neutral line 30; the outside of each phase line 10 is wrapped with a phase line insulating layer 11, and the outside of the phase line insulating layer 11 is wrapped with a conductive shielding layer 13; the zero line 30 is clamped between the three phase lines 10, and a zero line insulating layer 31 wraps the outside of the zero line 30, so that short circuit caused by direct contact of the zero line 30, the phase lines 10 and the conductive shielding layer 13 is avoided. Specifically, the explosion-proof cable 100 composed of the three phase lines 10 and the neutral line 30 may be applied to a three-phase ac circuit. Of course, the explosion-proof cable 100 may also be a single-phase cable.
Preferably, referring to fig. 3, the explosion-proof cable 100 may also be such that the conductive shielding layers 13 of at least one phase line 10 may be electrically connected to each other, respectively. For example, when the external leakage detecting device needs to electrically connect the conductive shielding layers 13, all the conductive shielding layers 13 in the explosion-proof cable 100 can be connected only by connecting the conductive shielding layer 13 corresponding to one phase line 10.
[ second embodiment ]
The second embodiment of the present invention provides an explosion-proof cable leakage detecting device, and the explosion-proof cable leakage detecting device 200 may be connected to the explosion-proof cable 100 described in the first embodiment, so as to detect whether the explosion-proof cable 100 leaks electricity.
Specifically, refer to fig. 4, which is a schematic view of a connection structure between the explosion-proof cable leakage detecting device 200 and the explosion-proof cable 100 shown in fig. 2. The explosion-proof cable leakage detection device 200 includes, for example, a leakage protection switch 110, a trigger circuit 130, a leakage detector, and a first explosion-proof cable; wherein the first explosion-proof cable is the explosion-proof cable 100 as shown in fig. 2 and has a first end and a second end opposite to each other along the power transmission direction thereof.
Specifically, the earth leakage protection switch 110 includes, for example: the leakage switch comprises a leakage switch body and a trigger circuit 130 electrically connected between an output end and an input end of the leakage switch body. The triggering circuit 130 is provided with a controllable triggering switch 132, when the triggering switch 132 is turned off, the triggering circuit 130 is not turned on, and the leakage switch body works normally; when the trigger switch 132 is closed, the trigger circuit 130 is turned on, so that the unparallel current is generated to cause the leakage switch body to work to trigger the leakage switch body to perform a corresponding power-off action.
The leakage switch body may be a leakage protection switch 110 used on the three-phase line 10. The leakage switch body can be a plurality of input ends and a plurality of output ends that correspond, a plurality of input ends insert respectively three phase lines 10 and a zero line 30 of first explosion-proof cable, and a plurality of output ends correspond respectively and connect out three phase lines 10 and a zero line 30 of explosion-proof cable. The input end correspondingly connected to the zero line is a first input end 112, and one of the output ends connected to the three phase lines is a first output end 111. The trigger circuit 120 is electrically connected between the first input terminal 112 and the first output terminal 111.
Of course, the leakage switch body may also be a leakage protection switch 110 used in a single-phase line, and the input end connected to the neutral line is the first input end 112, and the output end connected to the phase line is the first output end 111.
Specifically, the leakage detector further includes, for example, at least one optical coupling circuit 140 and a controller 160; each optical coupling circuit 140 is electrically connected between the conductive shielding layer 13 of the first explosion-proof cable and each phase line 10 or the zero line 30, and each optical coupling circuit 140 is electrically connected with the controller 160; for example, the leakage detector acquires the leakage current through the optical coupling circuit 140 and transmits the leakage current to the controller 160.
Specifically, the leakage detector is electrically connected to the first explosion-proof cable and the trigger switch 132, and when a leakage accident occurs to the first explosion-proof cable, the leakage detector obtains a corresponding leakage current, and then the controller 160 controls the trigger switch 132 to perform a closing action, so as to activate the leakage protection switch 110 to perform a power-off action, and disconnect the power supply of the first explosion-proof cable.
Preferably, the leakage detector further includes, for example: at least one amplification circuit 150, the at least one amplification circuit 150 being electrically connected between each opto-coupler circuit 140 and the controller 160; the amplification circuit 150 may amplify the leakage current acquired by the optical coupling circuit 140. For example, in the absence of the amplifying circuit 150, when there is a small leakage current, the leakage current cannot be recognized by the controller 160, and therefore the controller 160 cannot make a comparison result according to the small leakage current. When the amplifying circuit 150 exists, the small leakage current is amplified through the amplifying circuit 150, so that the controller 160 can recognize the small leakage current, and a comparison result can be obtained, thereby improving the detection accuracy of the leakage current.
Preferably, the leakage detector further includes, for example: the signal lamp 170, the signal lamp 170 is electrically connected to the controller 160, and the controller 160 can control the signal lamp 170 to be lighted. Preferably, the signal lamp 170 may also be a plurality of different signal lamps, wherein the plurality of different signal lamps may be signal lamps of different colors. For example, the plurality of different signal lights may include a red signal light and a green signal light, and the controller 160 controls to light the green signal light when the controller 160 does not monitor the leakage current; when the controller 160 monitors the current to ground, the controller 160 controls the red signal lamp to be lit.
Preferably, the leakage detector further includes, for example: and the control switch 180 is electrically connected between the conductive shielding layer 13 and the at least one optical coupling circuit 140, and can control whether the leakage detector performs leakage detection on the first explosion-proof cable. The control switch 180 is electrically connected to the controller 160, and the controller 160 can control the control switch 180 to control the opening or closing of the leakage detector.
In another embodiment, see fig. 5, which is a schematic view of another connection structure of the explosion-proof cable leakage detecting device 200 and the explosion-proof cable 100 shown in fig. 2, which is similar to the connection structure shown in fig. 4, but is different in that: also included is a second explosion-proof cable, which may be explosion-proof cable 100 as shown in fig. 2, and which has opposite third and fourth ends in its power transmission direction; wherein the fourth terminal is electrically connected to a plurality of input terminals of the leakage protection switch 110; a conducting circuit 190 is further electrically connected between the conductive shielding layer 13 of the second explosion-proof cable and the conductive shielding layer 13 of the first explosion-proof cable, and the conducting circuit 190 is provided with a conducting switch 191 to control the electrical connection of the two conductive shielding layers to be conducted or disconnected.
In yet another embodiment, see fig. 6, which is a schematic view of a connection structure of the explosion-proof cable leakage detecting device 200 and the explosion-proof cable 100 shown in fig. 3, which is similar to the connection structure shown in fig. 4, but differs therefrom: the conductive shielding layers 13 corresponding to each phase line 10 of the first explosion-proof cable are electrically connected and conducted through connecting wires 14.
In another embodiment, refer to fig. 7, which is a schematic view of a connection structure of the explosion-proof cable leakage detecting device 200 and the explosion-proof cable 100 shown in fig. 3, which is similar to the connection structure shown in fig. 6, but is different in that: also included is a second explosion-proof cable, which may be explosion-proof cable 100 as shown in fig. 3, and which has opposite third and fourth ends in its power transmission direction; wherein the fourth terminal is electrically connected to a plurality of input terminals of the leakage protection switch 110; a conducting circuit 190 is further electrically connected between the conductive shielding layer 13 of the second explosion-proof cable and the conductive shielding layer 13 of the first explosion-proof cable, and the conducting circuit 190 is provided with a conducting switch 191 to control the electrical connection of the two conductive shielding layers to be conducted or disconnected.
[ third embodiment ]
Referring to fig. 8, a method for detecting leakage of an explosion-proof cable according to a third embodiment of the present invention includes:
step S10, acquiring a plurality of first current data values respectively detected by the plurality of optical coupling circuits;
step S20, determining a magnitude relationship between each of the first current data values and a preset current threshold;
and step S30, determining the leakage of the first explosion-proof cable when any one of the first current data values is judged to be not less than the current threshold value.
Preferably, in the step S20, the plurality of current thresholds may further include a first current threshold and a second current threshold in sequence from small to large. For example, the first current data values respectively detected by the coupling circuits are sequentially compared with the current thresholds one by one to obtain a plurality of comparison results.
Preferably, a plurality of control actions may be provided in step S30, and each control action has a corresponding comparison result. For example, when the comparison result is that the first current data value is not greater than the first current threshold value, the controller 160 lights a green signal lamp, indicating that no electrical leakage occurs in the explosion-proof cable 100; when the comparison result is that the first electric current data value is between the first current threshold and the second current threshold, the controller 160 lights a red signal lamp and controls the alarm switch 122 to be closed so as to trigger the alarm 121 to send an alarm signal, which indicates that the explosion-proof cable 100 has an electric leakage current and the explosion-proof cable 100 needs to be checked; when the comparison result shows that the first current data value is greater than the second current threshold, the controller 160 controls the trigger switch 132 to be closed to switch on the trigger circuit 130 for discharging, so that the earth leakage protection switch 110 performs a breakpoint action, which indicates that two or more places in the explosion-proof cable 100 have an earth leakage condition, and the explosion-proof cable 100 must be powered off and checked.
[ fourth example ] A
Referring to fig. 9, an explosion-proof power transmission line based on an IT system according to an embodiment of the present invention includes: a plurality of explosion-proof cables and a plurality of leakage detection devices. The explosion-proof cables are the explosion-proof cables in the first embodiment and are electrically connected in sequence; the leakage detection devices are respectively the leakage detection device for the explosion-proof cable according to the second embodiment, and are respectively and electrically connected between two adjacent explosion-proof cables.
Preferably, the conductive shielding layer between each two adjacent explosion-proof cables can be connected through a conduction circuit 190, and the opening and closing of the conductive shielding layer between the two adjacent explosion-proof cables can be controlled by a conduction switch 191 on the conduction circuit 190.
For example, one embodiment of using the explosion-proof transmission line in a mine, such as a coal mine, may be: one or more anti-explosion cables 100 according to the first embodiment can be laid according to the depth or length of the coal mine to form an anti-explosion power transmission line of the coal mine; and according to the connection structure shown in fig. 4 or fig. 6, the explosion-proof cable 100 in the first order of connection is electrically connected to at least one explosion-proof cable leakage detection device 200 according to the second embodiment, and at this time, the explosion-proof cable leakage detection device 200 performs the explosion-proof cable leakage detection method according to the third embodiment to determine whether the explosion-proof power transmission line formed by the explosion-proof cable or the explosion-proof cables electrically connected in sequence leaks electricity.
When the explosion-proof power transmission line is formed by sequentially and electrically connecting a plurality of explosion-proof cables 100, at least one phase line 10 and one zero line 30 of two adjacent explosion-proof cables 100 which are electrically connected with each other are respectively and correspondingly electrically connected, and the corresponding conductive shielding layers 13 are correspondingly and electrically connected.
[ fifth embodiment ]
Referring to fig. 10, a method for detecting and identifying an electric leakage position of an explosion-proof power transmission line according to an embodiment of the present invention includes:
step S10, acquiring a plurality of first current data values respectively detected by a plurality of corresponding optical coupling circuits;
step S20, determining a magnitude relationship between each of the first current data values and a preset current threshold;
step S30, when it is determined that any one of the first current data values is not less than the current threshold, controlling the corresponding on-off switch to be turned off;
step S40, acquiring a plurality of second current data values detected by the plurality of optical coupler circuits, respectively;
step S50, determining a magnitude relationship between each of the second current data values and the current threshold;
step S60, when it is determined that any one of the second current data values is not less than the current threshold, determining that the explosion-proof cable detected by the corresponding leakage detection device leaks electricity.
Preferably, in the step S20, the plurality of current thresholds may further include a first current threshold and a second current threshold in sequence from small to large. For example, the plurality of first current data values respectively detected by the plurality of coupling circuits are sequentially compared with the plurality of current thresholds one by one to obtain a comparison result.
Preferably, a plurality of control actions may be provided in step S30, and each control action has a corresponding comparison result. For example, when the comparison result is that the first current data value is not greater than the first current threshold value, the controller 160 lights a green signal lamp, indicating that no electrical leakage occurs in the explosion-proof cable 100; when the comparison result is that the first electric current data value is between the first current threshold value and the second current threshold value, controlling the corresponding conducting switch to be switched off; when the comparison result is that the first current data value is greater than the second current threshold value, the controller 160 controls the trigger switch 132 to be closed to switch on the trigger circuit 130 for discharging, so that the earth leakage protection switch 110 performs an outage action, which indicates that two or more places in the explosion-proof cable 100 have an earth leakage condition, and the explosion-proof cable 100 must be interrupted and checked.
Specifically, in the step S60, when the second current data value is not greater than the first current threshold, the controller 160 lights a green signal lamp and controls the corresponding conducting switch to be closed, which indicates that no leakage occurs in the explosion-proof cable; when the second current data value is between the first current threshold and the second current threshold, the controller 160 lights a red signal lamp and controls the alarm switch 122 to be closed so as to trigger the alarm 121 to send out an alarm signal, which indicates that there is a leakage current in the section of the explosion-proof cable 100; when the second current data value is not less than the second current threshold, the controller 160 controls the trigger switch 132 to close to turn on the trigger circuit 130 for discharging, so that the earth leakage protection switch 110 performs the power-off action.
For example, another specific embodiment of using the explosion-proof transmission line in a mine, such as a coal mine, may be: a plurality of the explosion-proof cables 100 according to the first embodiment can be laid according to the depth or the length of the coal mine to form an explosion-proof power transmission line of the coal mine; the plurality of explosion-proof cables 100 are electrically connected in sequence, and the explosion-proof cable leakage detection device 200 according to the second embodiment is electrically connected between two adjacent explosion-proof cables 100 according to the connection structure shown in fig. 5 or fig. 7, at this time, the explosion-proof cable leakage detection device 200 executes the above-mentioned method for detecting and identifying the leakage position of the explosion-proof power transmission line, so as to determine the explosion-proof cable with the leakage fault in the explosion-proof power transmission line.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. An explosion-proof cable, comprising:
the conductive shielding layer is wrapped outside each phase line;
a zero line;
and the insulating layer is wrapped outside the at least one phase line and the zero line.
2. The explosion-proof cable of claim 1 wherein said phase wires are three;
the zero line clamp is arranged among the three phase lines.
3. Explosion-proof cable according to claim 1,
the conductive shielding layers of each of the phase lines are electrically connected to each other, respectively.
4. An explosion-proof cable leakage detection device, comprising:
a first explosion-proof cable as claimed in any one of claims 1 to 3, having opposite first and second ends in its power transmission direction;
the leakage protection switch is provided with an input end and an output end, the output end is electrically connected with the first end of the explosion-proof cable, the input end comprises a phase line input end, and the output end comprises a zero line output end;
the trigger circuit is electrically connected between the phase line access end and the zero line access end and is provided with a trigger switch;
a leakage detector electrically connected between the output terminal of the leakage protection switch and the first end of the explosion-proof cable; the method comprises the following steps:
the optical coupling circuits are respectively and electrically connected between each phase line and the zero line and the conductive shielding layer of the first explosion-proof cable;
and the controller is electrically connected with the optical coupling circuits and is also in control connection with the trigger switch.
5. The flameproof cable leakage detection device of claim 4, further comprising:
a second explosion-proof cable as claimed in any one of claims 1 to 3, having third and fourth opposite ends in its power transmission direction;
wherein the fourth terminal is electrically connected to the input terminal.
6. The flameproof cable leakage detection device of claim 5, further comprising:
the conducting circuit is electrically connected between the conductive shielding layer of the first explosion-proof cable and the conductive shielding layer of the second explosion-proof cable and is provided with a conducting switch;
wherein, the leakage detector is also connected with the conducting switch.
7. An electric leakage detection method for an explosion-proof cable, characterized in that an electric leakage detector in the electric leakage detection device for an explosion-proof cable according to any one of claims 4 to 6 detects electric leakage of a first explosion-proof cable, wherein a controller in the electric leakage detector executes the following steps:
acquiring a plurality of first current data values respectively detected by the plurality of optical coupling circuits;
judging the magnitude relation between each first current data value and a preset current threshold value;
and when any one of the first current data values is judged to be not smaller than the current threshold value, determining the leakage of the first explosion-proof cable.
8. An explosion-proof transmission line based on an IT system is characterized by comprising:
at least one explosion-proof cable, which is the explosion-proof cable according to any one of claims 1 to 3 and is electrically connected in sequence;
at least one electric leakage detecting device, each being the explosion-proof cable electric leakage detecting device of claim 6, electrically connected to the explosion-proof cable therein.
9. An anti-explosion power transmission line electric leakage position detection and identification method, characterized in that, in the anti-explosion power transmission line based on the IT system of claim 8, the controller of each electric leakage detection device respectively executes the following steps:
acquiring a plurality of first current data values respectively detected by a plurality of corresponding optical coupling circuits;
judging the magnitude relation between each first current data value and a preset current threshold value;
when any one of the first current data values is judged to be not smaller than the current threshold value, controlling the corresponding conducting switch to be switched off;
acquiring a plurality of second current data values respectively detected by the plurality of optical coupling circuits again;
judging the magnitude relation between each second current data value and the current threshold value;
and when any one of the second current data values is judged to be not smaller than the current threshold value, determining the electric leakage of the explosion-proof cable detected by the corresponding electric leakage detection device.
Priority Applications (1)
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| CN112509739B (en) | 2022-04-19 |
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